Дмитро

Dmytro Kalanyk
Senior Backend / DevOps Engineer
📍 Lviv, Ukraine (Open to Remote / Hybrid) ✉️ [open contact info](look above in the "contact info" section) 📱 [open contact info](look above in the "contact info" section) ✈️ Telegram: @xilftenis
💼 LinkedIn 💻 GitHub

PROFESSIONAL SUMMARY

Results-driven Senior Software & DevOps Engineer with 10+ years of commercial experience combining high-load
backend development with production cloud & Linux infrastructure management. Expertise spans PHP (7.4–8.5:
Symfony, Yii2, Laravel, custom modular frameworks), raw SQL & MariaDB/MySQL optimization without ORM
reliance, Node.js/WebSockets, Python, and multi-cloud infrastructure on AWS, Google Cloud Platform (GCP), and
Debian/Linux. Acted as hands-on DevOps Engineer at Yozma.Tech and across recent platforms, overseeing cloud
architecture, Nginx/PHP-FPM tuning, CI/CD, and Zabbix monitoring. Track record includes building GenAI-powered
resident support platforms (OpenAI API, WhatsApp, RAG), ACID-compliant digital wallets for iGaming/Lottery,
Big Data geospatial fleet telemetry systems, and call-center CRM suites with built-in VoIP/SIP telephony.

TECHNICAL SKILLS

Backend & Core: PHP (7.4–8.5), Node.js, Python, C# (.NET), JavaScript (ES6+), TypeScript, Custom MVC
Architectures

Frameworks & CMS: Symfony, Yii2, Laravel, Express.js, Vtiger CRM, Fusio API Manager, OpenCart, MODX, WordPress

Database & Raw SQL: MariaDB / MySQL, PostgreSQL (PostGIS), Direct SQL without ORM (complex joins, indexing,
ACID transactions, reporting)

Cloud & DevOps: AWS (EC2, S3, RDS), Google Cloud Platform (GCP), Linux (Debian/Ubuntu), Nginx, PHP-FPM,
Cloudflare, MariaDB Galera, Zabbix, Docker, Hetzner

GenAI & Messaging: OpenAI API (LLMs), RAG / Knowledge Bases, WhatsApp Business API webhooks, prompt
workflows

FinTech & Payments: Digital Wallets (ACID ledger, double-spending prevention), Stripe, Tipalti, PayPal, MetaTrader
(MT4/MT5)
Telephony & Real-time: VoIP/SIP integration, WebRTC, in-CRM telephony & call-center dialing (click-to-call, routing,
status webhooks), WebSockets

Caching & Queues: Redis, Memcached, RabbitMQ, background queue workers & cron scheduling
Quality & Workflow: PHPUnit, PHPStan, automated regression tests, legacy refactoring & PHP 7->8 migration,
Agile/Scrum, Code Review

PROFESSIONAL EXPERIENCE

Senior Software & DevOps Engineer — Independent Contractor 2025 – Present
Remote

AI-Powered Resident Support Platform (PropTech / GenAI): Architected an automated virtual assistant platform
connecting residents with property management via the WhatsApp Business API using PHP, Node.js, and OpenAI
API. Built a RAG knowledge base answering queries regarding maintenance schedules, building breakdowns, and
repair ETAs, cutting management office support overhead.
iGaming Lottery Platform & Digital Wallet System (FinTech): Engineered the core backend for an online lottery
and digital wallet system using Yii2, Symfony, and Node.js. Designed strict ACID-compliant financial transaction
ledgers in MariaDB/MySQL, preventing race conditions, balance discrepancies, and double-spending across deposit,
play, and withdrawal workflows.
DevOps & Multi-Cloud: Deployed and managed cloud-native instances across AWS and GCP, configuring Nginx
reverse proxies, automated backup syncs, and SSL/DNS via Cloudflare.
Stack: PHP (Yii2, Symfony), Node.js, AWS, GCP, OpenAI API, WhatsApp Business API, MariaDB/MySQL, ACID Transactions, WebSockets.

Senior Backend / DevOps Engineer — Yozma.Tech Dec 2019 – 2025 (5+ yrs)
Lviv, Ukraine (Remote / Hybrid)

Logistics Fleet Telemetry & Route Analytics Platform (Big Data) 2023 – 2025

Geospatial Telemetry Processing: Architected a high-throughput data pipeline ingesting live GPS coordinates
from international commercial vehicle fleets.
Algorithmic Analytics (Python): Developed Python background microservices for heavy geospatial calculations
(stop identification, route tracing, transit duration, and speed anomaly analysis) beyond PHP's capacity.
Real-Time Dashboards: Built low-latency operational monitoring dashboards using Node.js/WebSockets and
React, displaying live vehicle positioning and metrics for route managers.
Database Optimization: Optimized PostgreSQL/PostGIS spatial indexes (GiST) and caching layers in Redis,
achieving sub-second query performance on massive historical geospatial datasets.
Stack: PHP 8 (Symfony, Yii2), Python, Node.js, PostgreSQL (PostGIS), Redis, RabbitMQ, React, WebSockets, GCP, AWS.

FinTech, Trading & Call-Center CRM Ecosystem (Financix, TrxMarkets, Avens-Tech) 2019 – 2023

DevOps & Multi-Cloud Infrastructure: Served as DevOps Engineer alongside backend responsibilities; managed
production servers hosted across AWS and Google Cloud Platform (GCP) and Debian environments; tuned Nginx
and PHP-FPM pools, configured Redis/Memcached cache clusters, managed Galera replication, and automated
backup routines.
CRM & CPA Platform Architecture: Developed core modules for CRM/ERP systems handling customer
onboarding, call-center management, buyer panels, and dynamic analytics.
Vtiger CRM & MetaTrader Integration: Customized and extended Vtiger CRM, bridging customer records and
financial workflows directly with MetaTrader (MT4/MT5) via high-performance C# services for real-time account
synchronization.
VoIP & Telephony Integration: Integrated VoIP/SIP telephony services and WebRTC into the CRM interface,
supporting in-browser click-to-call, live call routing, recording synchronization, and operator queue metrics.
Payment Gateways & Payouts: Integrated global payment processors and automated payout rails (Stripe, Tipalti,
PayPal) with idempotent transaction handling and webhook reconciliations.
Direct SQL & High-Load Optimization: Built complex analytical reports and high-volume queries using direct
SQL without ORM in MariaDB/MySQL, optimizing execution plans and indexing.
PHP Migration & Monitoring: Led staged modernization from PHP 7.x to PHP 8.x, integrating PHPUnit testing
and static analysis; maintained server health via Zabbix alerting.
Stack: PHP 7.4–8.x (Yii2, Symfony, Laravel), C#, Node.js, MariaDB/MySQL, AWS, GCP, Redis, Memcached, Nginx, PHP-FPM, Vtiger
CRM, REST APIs, WebSockets, VoIP/SIP.

Software Engineer & IT Infrastructure Consultant — Public Sector & Aug 2014 – Present (Continuous Part-time)
Municipal
Boryslav Central City Hospital (2014–Present) & Boryslav City Council (2018–Present)

10+ Years Linux Administration: Maintain and support mission-critical Debian/Linux server infrastructure,
configuring Nginx/Apache, PHP-FPM, MySQL/MariaDB, and local networking.
Healthcare e-Health & Security: Supervised technical implementation and uptime of municipal e-health record
management systems, enforcing data confidentiality, access permissions, and automated backup routines.
Municipal Digital Services: Consult and implement digital portals and administrative automation tools for local
government services.
Stack: Linux (Debian), Nginx, Apache, PHP-FPM, MySQL, Networking, Data Security.

Full-Stack Engineer — Redoo-networks May 2019 – Jul 2019
Developed custom internal enterprise modules and automated business process workflows; tuned database queries
and accelerated internal operational turnaround.
Stack: PHP, JavaScript/jQuery, MySQL, REST API, Linux.

Full-Stack Developer — EcomExpertise Inc. Sep 2018 – May 2019
E-Commerce & Marketplace Analytics • Remote

Marketplace Price & Inventory Monitoring: Engineered automated web scraping pipelines collecting product
demand, inventory, and pricing data across Amazon and eBay for dynamic pricing algorithms.
E-Commerce Scaling: Maintained high-traffic online stores (ShearIntegrity, Massakari); executed seamless zero-
downtime CMS and database migrations across OpenCart and MODX platforms.
Stack: PHP, MySQL, JavaScript/jQuery, REST APIs, OpenCart, PrestaShop, MODX, WooCommerce, Linux.

Full-Stack Developer & Project Lead — RoketDev Aug 2016 – Aug 2018 (2 yrs)
Interactive Streaming (Sofan) & Cross-Border Logistics (KolosExpress)

Interactive Sports Streaming (Sofan): Developed backend services and real-time interactive chat for an
international sports co-watching platform using Laravel.
Cross-Border Logistics (KolosExpress): Architected and deployed an international package purchase and delivery
platform for diaspora communities, with automated order routing and payment handling.
Team Leadership & Client Delivery: Led engineering workflows, managed sprint delivery, and communicated
directly with international clients.
Stack: PHP (Laravel), JavaScript, MySQL, Web APIs, HTML5/CSS3, Linux.

Commercial Web Projects & Database Solutions — Freelance 2016 – 2019
Agro Exchange: Engineered database consolidation pipelines, merging multiple legacy data structures into a unified
relational database with fast search and multi-parameter filtering.
Rozetka Marketplace Integration: Developed automated catalog and inventory management integration for
merchant stores on Rozetka.
Custom Web Services: Built apartment rental portals and specialized e-commerce web applications.
Stack: PHP, MySQL, JavaScript, REST APIs, OpenCart, WordPress.

Junior Backend Developer — Izi Group Inc. Feb 2016 – Jul 2016
Built backend endpoints, database schemas, and reporting queries for Direct Source Properties (real estate CRM &
data analytics with gamification for US realtors) using CodeIgniter and Laravel.
Stack: PHP (CodeIgniter, Laravel), MySQL, REST APIs, JavaScript.

Junior Web Developer — Sitekafe Sep 2015 – Jan 2016
Started commercial engineering career: developed custom WordPress/OpenCart features, performed bug
remediation, and managed database content.
Stack: PHP, WordPress, OpenCart, MySQL, HTML5/CSS3, JavaScript.

EDUCATION

Drohobych State Pedagogical University — Specialist Degree in Software Engineering (Programmer Engineer) 2010 – 2016

LANGUAGES

🇺🇦 Ukrainian: Native (C2) 🇬🇧 English: Intermediate (B1/B2 – Professional Working Proficiency) 🇮🇹 Italian: Intermediate

🇮🇱 Hebrew: Elementary / Project-based